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O. J. FIRESTINE.

SHEET METAL PIPE BLANK.

APPLICATION FILED MAR. 16, 1922.

Patented N 0v. 28, 1922.

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Patented Nov. 28, 1922.

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OMAR J. FIBESTINE, OF INDIANAPOLIS, INDIANA.

SHEET-METAL-PIPE BLANK.

Application filed March 16, 1922. Serial No. 544,080.

To all whom it may concern:

Be it known that.I, OMAR J. Fiims'rINE, a citizen of the United States, residing at Indianapolis, in the county of Marion and State of Indiana, have invented a 'new and useful Sheet-Metal-Pipe Blank, of which the following is a s ecification.

The object my invention is to produce a sheet metal blank for use in the production of a pipe section of such construction that several such sections may be telescoped in succession, each end of each of such sections being so, formed as to properly resist the collapsible or expansive forces to which it may be subjected as a result of the telescoping.

The accompanying drawing illustrates my invention: Fig. 1 is a perspective view of a series of pipe sections embodying my invention, telescoped together; Fig. 2, a perspective View of a blank, embodying my lnvention, partially assembled; Fig. 3, a fragmentary perspective of a portion of the parts shown in Fig. 2; Fig. 4, a fragmentary perspective of the parts shown in Fig. 3, completely assembled and Fig. 5 a fragmentar sectional perspective.

n the drawing, 10 indicates the sheet from which the pipe blank is to be formed.

At one edge of the sheet, preferably within an inch or two of one end, I make a lateral shear cut 11, thus forming a short tongue 12 which is left unbent, the usual corrugations 13 being provided at this end of the sheet in order to provide the usual small-diameter portion of the completed pipe. The remaining portion 14 of thisedge of the sheet 10 is doubled back inwardly along a line at the root of the cut 11, in order to form an inturned hook as'olearly illustrated in Fig. 5.

The opposite edge of sheet 10 is doubled inwardly upon itself along a line parallel with, but at some distance from the free edge of the sheet, thus forming a rounded shoulder 16. This sheet is then again doubled back upon itself, so as to again project the edge of the sheet outwardly, along a line 17 thus forming a channel or pocket 18, having a radial dimension substantially equal to the thickness of the plate and this free edge of the sheet projecting beyond shoulder 16 a distance slightly less than twice the width of the inturned portion 14. The free edge of the sheet is laterally slit at 19 at a distance from the end of thesheet corresponding to that of the slit 11 so as to form a tongue 20. The remaining portion of this free edge of the sheet is then doubled outwardly back upon the sheet to form an outwardly presented hook 21, capable of interlocking with hook 14, the free edge of the hook 21 being spatcizg fif'oili slhoulili r 16 just enough to perm1 e 0 me to nest snu l shoulder 16. g y agamst A gbueantity of blanks such as have been descr (1, may be readily shipped flat. The user, in the field, may quickl assemble the sheets into pipe form in the fbllowing man- Her: The sheet being curved so as to bring the edges together, is twisted slightly, as indicated in Fig. 2 so that the tongue 12 lies beyond the end of the adjacent edge of the sheet and the inwardly presented hook 14 is hooked into the outwardly presented hook 21. Thereupon the sheet is straightened up, tongue 12 being projected into pocket 18 until its inner end comes into contact with the tained in opposition in substantially the same plane, at the same time presenting a substantially smooth exterior over which the usual insulating material may be readily and intimately wrapped.

The co-action of hooks 14 and 21' will resist any expansive forces applied to the end of the completed pipe and consequently resist the expansive force resulting from the insertion of that end of an adjacent pipe section at which the tongues 12 and 20 lie. At the same time shoulders or fold lines 16 and 14' are of suflicient radial dimension to substantially abut each other and ordinarily prevent collapse of the pipe especially when the usual insulating wrapping is in position.

At the opposite or small end of the pipe there is, of course, a tendency toward collapse, but this is prevented by the bottoming of tongue 12 in pocket 18.

It will be noted that by the above construction, the parts may be readily bent to the desired positions by the ordinary bending rolls because the various fold lines may be of such character as will be ordinarily produced,

that is to say, there is no necessity for square It will be understood that mere I claim as my inventionfi.

1. A sheet metal pipe blank having each longitudinal edge laterally cut, a portion at one side of said out of one edge of the blank being bent inwardly to form an inwardly presented hook, the correspondin at one side of it at the other edge 0 the sheet being bent ou'twardl to form an ontwardly presented "hook capa le of interlocklng w1t the said inwardly resenting hook, and the said last mentioned edge of the sheet being first bent inwardly, and then bent outwardly, along a fold line more closely adjacent the edge of the sheet, to form a pocket of pro er depth to receive that portion of the rst mentioned edge adjacent one end of the inturned hook, substantially as described.

2. A pipe blank comprising a sheet of metal' one longitudinal edge of which is folde and refolded upon itself along two fold lines spaced from each other and from the adjacent longitudinal edge of the sheet to form a double thickness shoulder and an adjacent pocket with the said edge ofthe sheet projecting beyond the mouth of the pocket and being laterally slit at an intermediate portion of its length, the said free edge, at one side of said slit being doubled upon itself to form a hook; the other edge of the sheet bein laterally slit at an intermediate portion 0 its le h and having a portion at one side of the slit doubled back upon itself to form a hook capable of interlocking with the first mentioned hook, the remaining portiomof said last mentioned edge being arranged to be slid endwise 'into a portion of the aforesaid portion mamas pocket, substantially as described.

3. A pipe blank comprising a sheet of metal having one lon itudinal edge bent .back upon itself throng out a portion of its portion being bent upwardly and rearward y back upon itself throug out a portion of its length to form a rearwardly extending hook,

the remaining portion of said len th formmg a tongue and having a portion of its opposite longitudinally extending edge bent backward upon itself and then forwardly to fo a pocket to receive said tongue, the rema nlng portion of said edge forming a tongue, the outer edge of said forwardly bent portion being bent upwardly and rearward y to form a hook to engage and cooperate with the hook formed on said firstmentioned edge.

In witness whereof, I, OMAR J Fmns'rma have hereunto set my hand at Indianapolis,

Indiana, this March 11, A. D. one thousand n ne hundred and twenty two.

OMAR J. FIREST'INE. 

